Answer:
There is evidence to suggest that postpartum women do not get enough sleep
Step-by-step explanation:
Given that in a recent survey of 151 postpartum women, the folks at the National Sleep Foundation found that the mean sleep time was 7.8 hours, with a standard deviation of 1.4 hours.
[tex]H_0: \bar x =8\\H_a: \bar x <8[/tex]
(left tailed test at 5% significance)
Mean difference = -0.20
Std error of sample = [tex]\frac{s}{\sqrt{n} } \\=\frac{1.4}{\sqrt{151} } \\=0.114[/tex]
Test statistic t = mean difference/std error =
= -1.76
df = 150
p value one tailed = 0.0402
Since p < alpha, we reject H0
There is evidence to suggest that postpartum women do not get enough sleep
